Perforating pencil



y 1933- F. A. RICE 2,118,230

PERFORATING PENCIL Filed May 18, 1933 3 Sheets-Sheet 1 77 Inventor May 24, 1938. F. A. RICE PERFORA'IINGv PENCIL Filed May 18, 1933 5 Sheets-Sheet 2 lnvenlor Fred/51 22479,

ByQA

3 Sheets-Sheet 5 F. A. RICE PERFORATING PENCIL FiledMay 18, 1935 May 24, 1938.

Fred A? 1 2506,

By W

Patented May 24, 1938 UNITED STATES PATENT OFFICE PERFORATING PENCIL Fred A. Rice, Joliet, Ill.

Application May 18, 1933, Serial No. 671,774

3 Claims. (01. 16489.5)

My invention relates to a perforating pencil, proximately concentric with the semi-circular and an important object of my invention is to portion [2 of the main body portion 8 is a shaft provide a perforating pencil of the self-contained opening I! and spaced below it is a vertically powered type, which is formed of a small number elongated opening 18 which communicates with of simple parts, so that it is efficient and is cathe interior 10 of the upper portion ll of the 5 pable of being manufactured at low cost. shank 6.

It is also an important object of my invention Having a shape corresponding to that of the to make a device of the kind described as commain body portion is the field magnet structure pact as efficiency of operation will permit, so that generally es d 0, e fo m of Wh ch is 10 the same may be manipulated in a manner which especially well shown in Figure 3. The field is 10 makes fine and delicate work easily performed, laminated, being made up of a suitable number including ruling therewith to a straight-edge. of plates of magnetically permeable metal. For- Other objects and advantages of my invention tions of the arms of the magnets are formed semiwill be apparent from a reading of the following circular as indicated at 2|, 2|, while the bight description in connection with the drawings, portion between the arms of the magnets is 15 wherein for purposes of illustration I have shown Wound as indicated at 22 with a suitable number a preferred embodiment of my invention. of turns of insulated wire of suitable gauge. It In the drawings: is important to note that the front face of the Figure l is a front elevational view of the emupper part of the main body portion 8 is set 99 bodiment. back as indicated at 24 in Figure 2 so that a Figure 2 is a side elevational view thereof. shoulder 25 is formed which is of a width equal Figure 3 is a front elevational view showing to the width of the field 20, so that the cover the cover member removed. member generally designated 26 can be attached Figure 4 is a front elevational view showing to the front face 21 of the main body portion 535 both the cover and the motor removed. and to the front face of the field by appropriate 5 Figure 5 is an elevational view of the interior bolts which pass through openings 28 in the field, of the cover member. see Figure 3, and into the openings I5, IS in the Figure 6 is a transverse vertical sectional view main body portion already referred to. through the upper part of the device disclosing The cover member 26 comprises a rather deep f;() the arrangement of parts of the interior mechahollow form shown to advantage in Figures 5 0 nism. and 6, which is of an outline and form similar Figure '7 is a transverse vertical sectional view to the upper part of the main body portion 8. through the lower part of the embodiment. This is secured in pOS t y bolts passing Figure 8 is a side elevational view of the tip ou h holes 30 in interior lugs 32 e f Figure 9 is an end elevational view of a portion responding to the lugs l3, [4. Another screw or 5 of the shaft showing the eccentric pin. bolt 34 is passed through a lower lug 35 into the Figure 10 is a view of one of the contact and shoulder 25 of the main body portion. supporting springs. Supported within the cover member 26 is a Referring in detail to the drawings the nudielectric plate 36 which is slotted in its lower meral 5 refers generally to the embodiment which end as indicated at 31 to fit over a headed screw comprises the upwardly tapering shank 6 which 38 which is anchored in the lower part of the is provided on its front side with ribs or grooves c v member- The Slotted lower end Portion of l. The upper part of the shank6tapers upwardly the plate 36 is angular as indicated at 39 to and merges into the main body of the d vi e rest upon the angular lower portion of the cover indicated at 8 which is pear-shaped. The front member a Shown in Figure M llnted On the 455 face of the main body portion 8 is hollowed out plate 35 at One Side Of the S10t is a brass Spring as indicated at 9 to constitute a portion of the 40 and on the Opposite Side in a m ar position motor housing. As indicated in Figures 2 and 6, another brass Sp the back IQ of the upper part of the main body The upper ends Of the Springs 49, 4| a e pro- 54) portion is flat and has projecting therefrom the Vided With journals 43 formed y turning semi-cylindrical upper portion ll of the shank t OVeT embrace the eXleS p 5 6. The upper part of the main body portio is which are connected to brush mounting plates semi-circular as indicated at 12 and provided with interior lugs l3, l4 provided with bolt holes The brush mounting Plates 45, 47 are I5, I6 for receiving the assembling bolts. Apnected to a dielectric plate 48 which has an open- 55 ing 49 receiving the rotatable shaft 56. Each of the plates 46, 4'! carries a carbon brush 5|, 52. Secured to the dielectric plate 36 between the spring arms 40, 4| is a third spring arm 54, and a second similar short spring arm 55 is located. on the lower end of the spring arm 4| see Figure 10. The short arms 54, 55 are arranged to engage contact bars 58, 5? which lead from the opposite ends of the winding 22 of the field magnet.

Passing threadedly through the front of the cover member is an adjusting screw 53 whose inner end is arranged to engage the back of the dielectric plate 36 so that the brushes El, 52 may be caused to move into or out of engagement with the three flat segments 59 carried by the adjacent face of the rotor 66 by adjusting the screw 58, whereby the rotor may be caused to rotate at different speeds. The segments 59 form the commutator of the rotor in a conventional arrangement.

The rotor Gil comprises the tripolar electromagnet mounted on the rotatable shaft 58. Supporting the rear end of the shaft 5 which has a thrust collar or flange 6! thereon, is a bronze bushing 52 fitting in the opening H and which has a lubricant passage 63 joining a lubricant passage 64 in the back wall of the main body portion. The rear end of the shaft has an eccentric pin 65 thereon for connection with the perforating slide is. The front end of the shaft is rotatably mounted in a bronze bushing 58 which contains interiorly a thrust bearing 61 engaging the front end of the shaft, the front end of the shaft being provided with an axial opening 68 and a lateral passage 69 for receiving and conveying lubricant.

Vertically slidable in the interior 'ill of the shank 6, that is, in the upper portion ii thereof is a squared slide 19 whose upper end is pivoted on the pin 55 on the back end of the shaft 58. Extending from the lower end of the slide it is the perforating shaft H which may extend beyond the lower end of the shank 6 as indicated at 72,

Into the lower end of the shank 5, as shown in Figure 7, is threaded a bit 13 on the tip 14. The tip M is provided with an upper enlarged bore 15, the lower part of this bore extending through the lower end of the tip 74 being reduced in diameter and downwardly tapered as indicated at W, and the lower end extremity of the shaft ii is similarly reduced in diameter and similarly tapered, so that on its down stroke, the travel of the shaft H is positively limited and guided in a predetermined manner, the contacting surfaces being so arranged that no jamming or wedging takes place.

By reason of the arrangement described and shown in Figure 7, chattering of the perforating end ll of the needle or shaft H is prevented, as well as a too great penetration of the tracing point into the work. In this way a smaller needle is made practical, and staggering of perforations in the work prevented.

It will be obvious that as the adjusting screw 58 is turned inwardly it will increase the pressure of the brushes against the commutator of the electro-magnetic rotor thereby producing a better electrical engagement, and increasing the speed of operation of the rotor and hence of the needle. Assembling the cover member 26 to the main body portion positions the spring arms 54, 55 of the cover member into electrical engagement with the field coil outlets 56, 57.

The bit portion 73 of the tip it is slotted as in dicated at '58 to provide the proper frictional engagement of the parts. It will also be observed that the cover member 25 has a notch 19 in one side edge to provide an opening for leading out of the casing the necessary electrical conductors 8G for connection with a suitable reduction transformer which is energized from a commercial or house current supply.

It will be observed that the commutator of the rotor has the segments 59 mounted on a plain dielectric disk 3i surrounding the shaft 55 and secured in a suitable manner to the rotor.

Although I have shown and described herein a preferred embodiment of my invention, it is to be definitely understood that I do not desire to limit the application of the invention thereto, and any change or changes may be made in material and structure and arrangement of parts, within the spirit of the invention and the scope of the subjcined claims.

What is claimed is:

l. A perforating pencil comprising a body having a tubular shank terminating in a tip, said tip having the lower part of its bore tapering downwardly to the lower end of the tip, a needle passing through the shank and having a downwardly tapering lower end passing through the tapered part of the bore of the tip and means for reciprocating the needle.

2. A perforating pencil comprising a body part provided with a tubular shank terminating in a tip also of tubular construction, the bore of the tip having a reduced lower portion which forms a shoulder with the upper portion, said lower portion tapering downwardly to the lower end of the tip, a needle located in the shank and tip and having a reduced lower part forming a shoulder at its junction with the upper part, the reduced part tapering downwardly and located in the tapered part of the bore of the tip and means for reciprocating the needle.

3. A perforating pencil comprising a body part provided with a tubular shank terminating in a tip also of tubular construction, the bore of the tip having a reduced lower portion which forms a shoulder with the upper portion, said lower portion tapering downwardly to the lower end of the tip, a needle located in the shank and tip and having a reduced lower part forming a shoulder at its junction with the upper part, the reduced part tapering downwardly and located in the tapered part of the bore of the tip and means for reciprocating the needle, said means including a shaft rotatably supported in the body and having an eccentric pin at one end thereof, and a slide connected with the upper end of the needle and having a hole therein for receiving the pin.

FRED A. RICE. 

